the mechanical fit of a pin and socket is where conductivity starts.corrosion on the surface causes disruption of current flow and signal.dielectric grease displaces moisture and oxygen ,the key players in corrosion,We use salt on roads and when I did my harness I found corrosion on a good portion of my connections.
To add conductive grease to a connector you are now creating a path for electricity to all other pins and circuits.an exageration of this would be no insulation on any wires, NOT good. the only way this grease could be good is if none of the grease is between other pins ,ONLY on inside of pin and socket not between the space between the pins on the connector body.In the auto industry conduction between circuits are Known as draws.very hard to diagnos do to the intermittent failure.I call them ghosts and ghosts are no fun to chase or catch without a PKE meter proton pack and trap!!! :hehehe :yes remember don't cross the proton beams,this would be a bad thing :lol: